I was in a similar situation a few years ago, and like you I gave the other mom a bunch of info and resources on gt and wasn't real sure at first about whether or not she used any of it. But, then she started asking more and more about it and eventually decided, against great family pressure to send her son to the school that DD went to for the year she did K and gr 1 in a year because we'd had success there for her.
Just last week I got an email from her saying that things were going well and the teachers had seen his gifts (through his excess energy) and were getting him what he needs.
So, keep your fingers crossed, you could hear from them soon and need to extend the encouragement a bit more to help them become pushy.